MAX4587 查看數據表（PDF） - Maxim Integrated
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MAX4587 Datasheet PDF : 12 Pages
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Serially Controlled, 4-Channel
Audio/Video Multiplexers
Table 1. Command-Bit Mapping
COMMAND
BIT
SWITCH
D7 (MSB)
x
D6
x
D5
x
D4
x
D3
NO4 to COM
D2
NO3 to COM
D1
NO2 to COM
D0 (LSB) NO1 to COM
X = Don’t care
TERMINALS
10, 1
9, 1
7, 1
6, 1
POWER-UP
STATE
x
x
x
x
0 (Open)
0 (Open)
0 (Open)
0 (Open)
Table 2. Truth Table
LOGIC
0
1
NO_ SWITCH
OPEN
CLOSED
Table 3. Address Bit Map
ADDRESS BIT (A)
0
1
ADDRESS
0110 1010
0110 1110
70%
70%
SDA
20%
20%
tSU, DAT
tLOW
tHD, DAT
SCL
tHD, STA
70%
20%
START CONDITION
70%
70%
20%
20%
tHIGH
tR
tF
Figure 1. 2-Wire Serial-Interface Timing Diagram
tSU, STA
70%
20%
tHD, STA
70%
70%
REPEATED START CONDITION
tSU, STO
70%
20%
tBUF
70%
70%
20%
STOP CONDITION START CONDITION
SLAVE ADDRESS BYTE
COMMAND BYTE
SDA
MSB
SCL
LSB ACK MSB
LSB ACK
START CONDITION
STOP CONDITION
Figure 2. Complete 2-Wire Serial-Interface Transmission
Start and Stop Conditions
The bus master signals the beginning of a transmission
with a start condition by transitioning SDA from high to
low while SCL is high. When the bus master has fin-
ished communicating with the slave device, it issues a
stop condition by transitioning SDA from low to high
while SCL is high. The bus master is then free for
another transmission.
Slave Address (Address Byte)
The MAX4586 uses an 8-bit-long slave address. To
select a slave address, connect A to V+ or GND. The
MAX4586 has two possible slave addresses, so a maxi-
mum of two of these devices may share the same
address line. The slave device MAX4586 monitors the
serial bus continuously, waiting for a start condition fol-
lowed by an address byte. When a slave device recog-
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